The English-language justification for segregation — that Mexican American children needed special instruction because Spanish was their home language — collapsed under examination at the trial. Many of the children assigned to Mexican schools, including the Mendez children, spoke English fluently and had previously attended integrated schools. No language proficiency test was administered before assignment. The sorting mechanism was surname and visible ancestry, not linguistic need.
This gap between the stated justification and the actual practice was one of the foundations of David Marcus’s case. If the segregation were genuinely about language instruction, it would have been organized around language ability. Instead, children who bore Spanish surnames were assigned to Mexican schools regardless of whether they spoke Spanish, spoke English, or both. The mechanism was racial, not pedagogical.
For Sylvia Mendez and her brothers, the situation was particularly sharp. They had previously attended schools with white children in Santa Ana, had always spoken English, and were being told that they needed to attend a school organized for children who could not access the standard curriculum. The stated justification made no sense applied to their actual situation, and it made no sense applied to many of the other children in the case.
## David Marcus and the Legal Strategy
The choice to hire David Marcus as the families’ attorney was consequential for how the case was argued and what legal theories it developed. Marcus was not a civil rights specialist in the modern sense — the field as such barely existed in the 1940s — but he had relevant experience in challenging segregated public accommodations in California, and he had won.